howards11 Posted June 26, 2005 Share Posted June 26, 2005 2000 Forester. 87 octane. Philadelphia, PA NO PROBLEMS Every once in a while I throw in a bottle of Marval Mystery Oil. ~Howard :cool: Link to comment Share on other sites More sharing options...
jib Posted June 27, 2005 Share Posted June 27, 2005 87 works fine in mine. How is your air cleaner and intake tract? Is the filter clean and the entire intake system clear? Have you considered disconnecting the battery for 1/2 hour to let the ECU reset. The issue may clear itself. Aside from the price of gas in CT, there should be no issues. Jack Link to comment Share on other sites More sharing options...
nurseman Posted June 28, 2005 Share Posted June 28, 2005 i had an 02 impreza rs with the SOHC engine and put over 110K miles when i traded it in. i never had an engine knock or ping ever. i used 87 octane when i first got the car but when i put Iridium spark plugs in i had to switch to 93 octane and changed fuel filter regularly.i would suggest trying an octane booster, or gas treatment and even you can put a few ounces of tranny fluid in the oil crank case and that will quiet alot of ping and valve noise. when you put tranny fluid in the crank case it acts kinda like a cleaner to the engine and can loosen build up which can be making noise. Link to comment Share on other sites More sharing options...
jib Posted June 28, 2005 Share Posted June 28, 2005 Are you sure you have the correct spark plug? If you do have the correct ones installed, try going to a plug which is one heat range colder. Jack Link to comment Share on other sites More sharing options...
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